If taking a recumbent on a train is a significant factor, a lowracer may not always fit the bike spaces. That said, my experience was with my HP Speedmachine with the boom set a long way out. Using trains more often was one reason I bought my Lightning P-38; climbing hills was the other. It was frighteningly expensive at the time, but it's the bike I use for 90% of my riding. I sit with the same eye level as a car driver, and the bike's agility and upright seat means low speed riding and manoeuvering in traffic is easy. Not Brompton easy, of course, but definitely recumbent easy. It won't carry four panniers though, and baulks at two if they're heavily loaded.
My first suggestion for a good all-round recumbent would be a dead heat between the HP Streetmachine a la Kim, and the quasi-low Nazca Fuego that Darkerside and Ruggtomcat ride. Both are well capable of four panniers, both have suspension (Fuego rear only), and both are exceedingly well made. Go for the SMGT if you prefer under- (or over-) seat steering and a higher seat; Fuego for over-seat steering and a lower seat. I never found any particular difficulties in traffic with the reclined seat angle and low position of my SpM, but I did tire of car drivers being so protective of my wellbeing that they had to tell me. If you want to look further afield, Lightning's Phantom would also make an excellent city and touring recumbent.
