As a young kid the engineer invited into the cab of a SW1 ( the station switcher at Camden Station in Baltimore ) and he let me ride as he switched coaches from one track to another. BIG THRILL for a 3 year old kid!!!
Later I was invited by the conductor aboard a B&O GP7 which was doing some switching at a Westinghouse distribution center in my hometown of Savage, Md. I rode with the crew and got to blow the horn as the GP7 approached the grade crossing at RT 1. FUN TIMES!!!
I rode RCD cars ( as BANDOBOB did ) from Camden Station to Laurel Maryland, on what is now called the Camden Line. I also rode a B&O passenger train from Camden Station to Jersey City back in 1956. AGAIN BIG FUN!!!
I was invited by the fireman aboard a B&O steam locomotive when I was 2 ( I still remember it quite vividly )
I rode a 23 car Pennsylvania Railroad excursion to NYC in 1966 with my 8th grade class. This train was pulled by two GG1s! AWESOME!!!!
On my layout I have a B&O SW1( MTH ) , a GP9 ( not a GP 7 but close enough ) ( MTH ) , 3 RDC cars ( Lionel ) and two scale GGIs ( by Williams one powered#4876 and one dummy ). I have a B &O Atlantic ( Lionel ) and a B&O Hudson ( Williams ), and a ABA set of B&O FA2s ( MTH ). Yes I run what I rode.