'train riding dollars'
A term you might have heard your grandfather use. So what does it really mean? With the growth of the railroads came more and more passengers along the route. At that time there was Federal money printed by the US Govt and state money printed by the States. Since the trains traveled across the US thru many states they would only accept money that was Federal money as only it was accepted across the US. So to buy a ticket that took you across multiple states you had to have 'train riding dollars'...
Bullshit.