cars from Milwaukee Road, for example. Because of their enormous usage of sealed glass, the cooling of the cars required massive air conditioning capacity. Maintenance and repair of these cars was costly. Breakdown of the air conditioning system on the road, even in winter, could render a car unusable. Since the 1980s, dome cars have become rare since Amtrak introduced Superliner bi-level passenger cars that are tall over the length of the car (but at a stretch the Superliner lounge car could be considered a dome car). Dome cars are very popular on tourist railways and private charter rail services. Some railroad museums have preserved several dome cars. These cars are very popular with visitors who often remember the spectacular rides they had in these cars. While the dome car is a mostly North American feature, a few also operated in the scenic areas of Europe. The German Federal Railway had five low-profile dome cars built in the early-to-mid 1960s for its "Rheingold" and "Rheinpfeil" trains. After being retired from regular service, these cars operated in excursion and charter service throughout Europe. Current usage India In Indian Railways Currently 41 coaches are already running in different railway zones of the country. The Indian Railways (IR) is planning to introduce 49 more vistadome coaches by the end of the current financial year to meet the growing demand of tourists. So far, 41 coaches are already available in the different railway zones of the country. Canada Via Rail Canada operates the largest fleet (28) of true dome cars in the classic sense in that they offer a 360° view of the scenery. All were built by Budd for the Canadian Pacific Railway in 1954-1955 and transferred to Via service in 1978, where they continue in service. The Ontario Northland Railway operates dome cars on the Polar Bear Express from Cochrane to Moosonee. The Canadian National Railway operates a former Great Northern dome coach in its business car fleet. In 2018, Canadian Pacific acquired ex-Southern Pacific dome car #3605. It was rebuilt and repainted into Canadian Pacific's Tuscan red and gold livery, and renamed 'Selkirk' while retaining its road number. The car is now being used on the business train as well as the Royal Canadian Pacific excursion train. The Orford Express dinner/excursion train, which operates out of Sherbrooke, Quebec, Canada, includes a former Northern Pacific dome sleeper. Panama The Panama Canal Railway