You should ask my 9 y/o grandson. He's been on most of the rail transit systems around the country from Tri-rail, Sunrail and Brighline in Fla up the coast to to the Boston T and west to California (all systems SFO to San Diego) and that includes NJT, Septa, Baltimore light rail, NYC subways, Metro North, LIRR, PATH and Staten Island RR, VRE, MARC, Cleveland RTD, Chicago, Dallas, Albuquerque, Phoenix, Atlanta (where he lives) and even in Montreal, Ottawa and Toronto. I estimate he's been on 40 or more transit systems. They're heading up to the Northwest and Alaska this summer. He'll pick up a bunch more. I gave up tracking the list but I think his mom has kept it up.