Interesting. One of the guys in my hunting party owns the local propane company and also stores bulk propane, he owns a 'bottle farm a couple miles west of here with a large number of 10K gallon storage bottles (all fenced in and secure but with a rail siding and off load facilities as well and he 'product' railed in but switched back to bottle semi's because one, the railroad charged him detention after 48 hours no exceptions, two, he never knew when the rail would drop cars and they could never give him not even an approximate drop time, three, when the loaded cars left the propane facility, the rail would never tell him and could not even estimate travel times, and 3, it was no less expensive (factoring in all the variables) than having it delivered in semi trucks.
Now that may not hold true today with the excessive cost of diesel fuel but the rail is also paying substantially more for diesel as well and has increased their transportation rates, accordingly via a fuel surcharge (just like everyone else has).
Because his facility is secure and monitored 24-7, can you imagine getting a call from the rail at 3AM requesting access and then having to drive (in his case) 15 miles to unlock the rail siding gates.
For him over the road trucking is much more convenient and the cost is a wash.