This was a promotional video circa 1942 and it is available to download for free. A Great Railroad At Work A Jam Handy Production There are three pages to download it from in 3 parts: http://www.archive.org/details/GreatRai1942_3 This is public domain so enjoy!!!
Here is part 2 and part 1 http://www.archive.org/details/GreatRai1942_2 http://www.archive.org/details/GreatRai1942_1