On CL and TE routes are there any mail boxes on the platforms, or postal services in stations? A neat collection would be postal cancellations from every stop along the way. Here's an eBay link to train-related US postage items
http://stamps.shop.ebay.com/United-States-/261/i.html?_nkw=trains&_catref=1&_fln=1&_npmv=3&_trksid=p3286.c0.m282
http://stamps.shop.ebay.com/United-States-/261/i.html?_nkw=trains&_catref=1&_fln=1&_npmv=3&_trksid=p3286.c0.m282