#1 Amtrak- when I was a young child in the mid-90s, I got 3 of their passenger cars- some of them when shopping with my mom no less which makes the emory even better. They were the 12 inch cars, so not top of the line, but it was a big expense for my parents at the time. The 2nd engine that I ever got(Christmas present) was a 1999 Williams Amtrak GP9. Also, made 2 trips down to Florida from Philly's 30th street station in 2002 and 2003 and made a return trip from Florida to Philly in 2005. It's difficult for me not to have Amtrak running on at least one of my lines
#2 Chessie System- used to see these cars come though a train yard every now and then, they hadn't been changed over to CSX yet. I loved the colors most of all. Got my first engine, a K-Line S-2 switcher, from my Pop in 1996. Chessie Sytem with B&O sign.
#3 Conrail- My grandparents lived right across from one of the few lines that was left from the LV RR. Conrail was the road name I saw most frequently and I loved those colors. My op bought me quite a few Conrail N-scale pieces
#4- Baltimore & Ohio- The Budd Cars got me into the B&O. Once I started researching its history I was even more intrigued.
#5 Lehigh Valley RR- I grew up in the Valley and still live and work there. My Pop had some great pictures of some of their trestles and we'd often walk the tracks on a Sunday afternoon or a weekday during the Spring.
If I could, I'd probably include the Ives Railway Lines 
