Railway Ribaldry

It seems amazing that such an august a company as the Great Western Railway would give Heath Robinson a free hand to devote an entire book to poke gentle fun at the early days of their empire. But this they did, on the occasion of the railway's centenary in 1935, the result being Railway Ribaldry. All aspects of railway construction and operations were covered, all drawn in meticulous detail and with the author's renowned imagination and humour. There are page after page of contraptions, most of which look as though they could actually work. Original copies must be very collectable, mine being a reprint published by Ian Allan in 1970 (for 17/6). I believe that it has been reprinted several times since; if you see a copy, buy it!