British demand For.
One cannot speak for other nations, but it would seem that the 'Railcar is something unique to the British railway system. The first cars with twin cabs were built for the Great Western and saw service between Bristol and Swindon from the late 1940' to the early 50's, despite their popular appeal nothing more was done to improve them.
The 1950's saw the re-introduction of these one coach units operating on small lines, some where termed rail buses rather than cars and they were an essential link prior to Beaching. The Class 101 got the idea off with two to three car Diesel Multiple Units (DMU's), but the 117/121 were demanded for sharper bends in Cornwall.
Past smaller steam locomotives and limited stock could work these lines, but the newer carriages and locos were to long. By the 1970's plans where in progress for the Pacer Class 150 and 153 units, which is some cases were nothing more than a Leyland bus on a carriage chassis.
Northern-Ireland railways had developed a spread of single and multiple rail cars from the 1930's, many of these originated on the various narrow gauge lines that were still in operation in the province of Ulster. Some were sold to the Isle of Man, but very little was shared I believe with the mainland. NIR did by some unusual vehicles from the Southern Railway one-offs built at Norwood Junction?
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