Canarsie were changed to read Woodlawn Road (which is no longer the name of a road) and Rockaway Parkway. All services would be color-coded for map and rollsign purposes. This proved a daunting task, since the TA wanted to ensure that no two services with exactly the same color would operate over the same line. With a lot of imagination and a lot of color variations, this goal was achieved but proved unwieldy. The colors did not have any particular logic and still produced ambiguity; notably the A service and the E service shared miles of line between Midtown Manhattan and the Rockaway Line in Queens, one as an express, the other as a local. But the A was colored dark blue and the E light blue, not always easily distinguishable. The 8 designation was brought back for the only remaining IRT elevated service, the IRT Third Avenue Line in the Bronx but trains never displayed the number. When the Lo-V cars (which did not have front signs) were replaced by R12 cars the front roll signs in use did not contain the number 8 and instead displayed the word shuttle. For map and sign purposes MJ was assigned to the last old-style elevated line, standing for "Myrtle Avenue Line to Jay Street", while the "Myrtle Avenue line to Chambers St." subway service would finally receive its M designation. The short-lived new Sea Beach Line super-express service was made NX. The Q, QT and T disappeared when the Chrystie Street Connection opened; thus they never had colors (until after the elimination of double letters, when the Q came back; by that time the current color system was in place). By 1968, all shuttles (SS) were green. For a short time, the off-hour shuttle between Metropolitan Avenue and Myrtle Avenue was added in 1969 when the MJ service to Jay St. was discontinued, and that part of the line abandoned. The shuttle was soon renamed "M", however, as it only ran when the M did not run to Manhattan. The system immediately showed evidence of problems for various reasons: Different services at common stations shared common destinations by different routes. N, B and QJ services arriving at DeKalb Avenue, for example, all had Coney Island as a destination, but had no mention of the widely separated routes (Sea Beach Line, West End Line, Brighton Line) used to get there. Service labels