Average number of seats per Amtrak train

For all my complaints and suggestions that particular routes really need an extra car or two (such as the Carolinian), I've never really had a good way of estimating the length of said trains except counting cars on Youtube videos, a task which is, quite frankly, somewhat less than appealing. However, the other day it hit me that since, courtesy of the FRA, we have the number of passenger-miles per train-mile, and from Amtrak's own monthly performance reports we can derive the occupancy of each train route, we can simply divide the passenger-miles per train-miles by the occupancy in order to figure out how long each train is, to an approximate average. It's not exact (the Acela does not have 304 seats for instance), but it should be within the right ballpark figure. If there's anything that jumps out as particularly weird or off, please let me know.

Train	Average seats per train
Acela	312
Keystone	335
Northeast Regional	442
—Richmond/Newport News	437
—Lynchburg	506
—Norfolk	510
—New Haven/Springfield	242
Capitol Corridor	314
Carolinian	331
Cascades	261
Downeaster	290
Adirondack	270
Empire Service	388
Ethan Allen Express	387
Maple Leaf	203
Heartland Flyer	224
Hiawatha	406
Hoosier State	153
Carl Sandburg/Illinois Zephyr	266
Illini/Saluki	332
Lincoln Service	311
Blue Water	361
Pere Marquette	221
Wolverine	396
Kansas City-St. Louis	178
Pacific Surfliner	474
Pennsylvanian	303
Piedmont	159
San Joaquins	315
Vermonter	298
Auto Train	512
California Zephyr	294
Capitol Limited	289
Cardinal	225
City of New Orleans	262
Coast Starlight	356
Crescent	303
Empire Builder	352
Lake Shore Limited	384
Palmetto	319
Silver Meteor	357
Silver Star	307
Southwest Chief	290
Sunset Limited	264
Texas Eagle	259