CROSS-REFERENCE TO RELATED APPLICATION 
       [0001]    This is a continuation, under 35 U.S.C. §120, of copending International Application No. PCT/EP2012/068936, filed Sep. 26, 2012, which designated the United States; this application also claims the priority, under 35 U.S.C. §119, of German Patent Application DE 10 2011 083 534.2, filed Sep. 27, 2011; the prior applications are herewith incorporated by reference in their entirety. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention: 
         [0003]    At present, as can be seen from the periodical “ETR”, September 2010, No. 09, pages 532 to 538, there is work on the standardization and harmonization of the functional configuration and construction of a future European driver&#39;s cab for locomotives and traction units. Within that work, the concept of a locomotive driver&#39;s cab having four displays that are disposed in a ring configuration beneath the windshield of the locomotive driver&#39;s cab, has been developed. The locomotive driver must monitor the track and must additionally observe the four displays while the railway vehicle is traveling. 
       SUMMARY OF THE INVENTION 
       [0004]    It is accordingly an object of the invention to provide a locomotive driver&#39;s cab, which overcomes the hereinafore-mentioned disadvantages of the heretofore-known cabs of this general type and which allows the locomotive driver more time to observe the track and thus contributes to increasing safety in rail traffic. 
         [0005]    With the foregoing and other objects in view there is provided, in accordance with the invention, a locomotive driver&#39;s cab, comprising a front-view display with a display of information relevant to the railway vehicle in the field of view of the driver of the locomotive. 
         [0006]    There are front-view displays known from the following website: http://de.wikipedia.org/wiki/Head-up-Display, which are used in military aircraft for displaying information relating to avionic, radar or weapon systems and in automobiles for speed displays, but to date it has not been known to use front view displays with their accompanying significant advantages, in modern locomotive driver&#39;s cabs having a relatively large number of displays. 
         [0007]    There is thus a significant advantage of the locomotive driver&#39;s cab according to the invention in that with it the information relevant to the railway vehicle is disposed in the field of view of the driver of the locomotive and can therefore be perceived by the driver together with the track observation. The locomotive driver therefore has to take notice of the displays less often than heretofore and can concern himself or herself more intensively than previously with track observation. This also contributes to increasing traffic safety. 
         [0008]    With the locomotive driver&#39;s cab according to the invention, the projection screen of the front-view display can be constructed differently. For example, the projection screen can be disposed as an additional projection panel in front of or behind the windshield of the locomotive driver&#39;s cab in the field of view of the driver of the locomotive. It is seen as particularly advantageous, however, if the windshield of the railway vehicle is the projection screen of the front-view display. 
         [0009]    The imaging unit of the front-view display is advantageously connected to important systems of a railway vehicle in order to be able to access information relevant to the railway vehicle and to be able to display the same on the projection screen of the front-view display. It is therefore advantageous that the imaging unit of the front-view display be connected to the operating system of the vehicle controller and be connected to the operating system of the train protection system. 
         [0010]    It is seen as particularly advantageous if the imaging unit of the front-view display is connected to an evaluation device of a camera system at the front of the railway vehicle constructed in such a way that the respective track route is displayed on the projection screen. 
         [0011]    There is then also the advantageous possibility of constructing the evaluation device in such a way that the respective track route is marked on the projection screen with a stopping point assuming full braking and is thus easy to read for the locomotive driver. It is further advantageous, regarding the increase in traffic safety, if the evaluation device is constructed in such a way that in each case the track route is displayed while recording obstructions on the projection screen. It contributes to the further facilitation of the work of the driver of the locomotive and to increased traffic safety if in the locomotive driver&#39;s cab according to the invention the image generating unit, being supplied with two similar types of information from different systems, is constructed in such a way that it outputs optical signals of different colors for the information from the different systems, and the optical module of the windshield display contains two mirror systems in such an orientation that the optical signals relating to different information are incident in the same place on the projection screen. If the information from the two systems is the same then this results in a display on the projection screen with mixed colors that is easy to read. If, on the other hand, the information is different, it results in a display with a different color and a different shape. The locomotive driver can thus tell immediately that the information no longer agrees, which points to impaired information generation in one of the two systems. 
         [0012]    The two similar types of information can advantageously be safety-relevant information. 
         [0013]    It is also advantageous if the two similar types of information are speed information and if the optical signals relating to the different speed information each produce a seven segment display at the same point on the projection screen. If the speed information is the same, it results in an easily legible seven segment display in a uniform mixed color. If the two items of speed information differ from each other, this results in information on the projection screen of the front-view display that is not easily legible, because two different seven segment displays are overlaid and a non-uniform color image results. 
         [0014]    Other features which are considered as characteristic for the invention are set forth in the appended claims. 
         [0015]    Although the invention is illustrated and described herein as embodied in a locomotive driver&#39;s cab, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims. 
         [0016]    The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
         [0017]      FIG. 1  is a diagrammatic, front-elevational view of a section of a windshield forming a projection screen of a front-view display of a locomotive driver&#39;s cab according to the invention, showing a correct display of a speed; 
           [0018]      FIG. 2  is a view similar to  FIG. 1  of the same section but illustrating an incorrect display; 
           [0019]      FIG. 3  is a fragmentary, side-elevational view of a railway vehicle in which a locomotive driver&#39;s cab is installed; 
           [0020]      FIG. 4  is a perspective view of a camera system for displaying a track route; and 
           [0021]      FIG. 5  is a front-elevational view of an imaging unit. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0022]    Referring now to the figures of the drawings in detail and first, particularly, to  FIGS. 1 and 2  thereof, there is seen a section  1  of a windshield  2  of a locomotive driver&#39;s cab, which also forms a section of a projection screen  3  of a front-view display which, apart from the projection screen  3 , includes an imaging unit and an optical module in a known manner. The imaging unit is, however, implemented with two imaging devices in this case, in such a way that it can be provided with speed information from two systems of the railway vehicle and outputs optical signals of different color, e.g. green and yellow. Accordingly, the optical module is equipped with two mirror systems, which are disposed in such a way that they direct optical signals onto the illustrated section  1  one above the other, forming a seven segment display  4  of the speed of the railway vehicle. 
         [0023]      FIG. 1  shows a correct seven segment display  4  with speed information “087”. In this case, the green (right hashed) and yellow (left hatched) illuminated segments of the seven segment display  4  from the two imaging devices are fully aligned with each other. The speed information is therefore easy to read for the locomotive driver on all segments because of the uniform blue mixed color (cross-hatched) and moreover it signals to the driver that the speed measurement with the two systems of the railway vehicle is correct. 
         [0024]      FIG. 2  shows an impaired speed display in which “0” is correctly reproduced because it uniformly shows the blue mixed color. However, this no longer applies with regard to the other numbers, which have blue areas (cross-hatched), green areas (right hatched) and a yellow area (left hatched) and hence notify the locomotive driver of a faulty speed determination. 
         [0025]      FIG. 3  shows a railway vehicle  10  in which the locomotive driver&#39;s cab is installed. A position of a driver  12  is shown schematically. The vehicle  10  includes the windshield  2  which forms the projection screen  3  of the front-view display. The front-view display includes, apart from the projection screen  3 , an imaging unit  14  and an optical module  16 . The imaging unit  14  is connected to the operating system of a vehicle controller  18  and the operating system of a train protection device  20 . 
         [0026]    The railway vehicle  10  also includes a camera system  22  at its front that is constructed in such a way that a track route  24  is displayed on the projection screen in each case. The imaging unit  14  is connected to an evaluation device  26  of the camera system  22 . As is shown in  FIG. 4 , this device  26  is constructed in such a way that the displayed track route is marked on the projection screen  3  with a stopping point  28 , which indicates the point at which the railway vehicle  10  can be stopped if full braking is applied.  FIG. 4  also shows a marking of the displayed track route with obstacles  30  detected by the camera system  22 . 
         [0027]      FIG. 5  is a detailed view of the imaging unit  14  and the optical module  16 . This unit  14  includes two imaging devices  32  and  34  in such a way that it can be provided with speed information from two systems of the railway vehicle  10  and outputs optical signals of different color. As explained above, the optical module  16  is equipped with two mirror systems  36 ,  38  which are disposed in such a way that they direct optical signals onto the illustrated section  1  one above the other, forming the seven segment display  4  of the speed of the railway vehicle  10  on the projection screen  3 .
A locomotive driver's cab allows a locomotive driver a comparatively long time for observing a route by providing the locomotive driver's cab with a front vision display for displaying rail-vehicle-relevant information in the field of vision of the locomotive driver.