We booked a round trip to Omaha for 2018. Points going and cash returning. The cash segments were OMA-CHI, (BR) CHI-WAS, (BR) WAS-PHL.(NER BC) When we booked our tickets the train connections showed CZ, CL and NER business only. As a select member I have several free class upgrade coupons. Was going to book the NER segment coach and use the upgrade coupon but it didn't. show up on the trip options. Anyone know why? Is there a way to change this without upsetting the fare on the entire return trip?