Rivnuts from Homestead, PA on 6/4/2022 3:41:11 PM:
Mr. Laubach:
I've taken the Capital Limited in both directions a few times including a couple of weeks ago. They have never checked or even inquired about my carryon bags that included a jet stove gas cylinder, Swiss Army knife etc. The Amtrak instructions also require you remove all your bags from your bike before putting in on the train. I generally do that to ensure they do get lost or redirected in transit. However, on the latest trip I did leave my frame bag on the bike as it is rather time consuming to get on and off the bike securely. No one at the station noticed or objected. In short, Amtrak is a rather loose operation in these regards compared to the airlines. I guess they don't have as far to fall. :-)
There a several hotels within a handful of blocks of the Pittsburgh train station with the closest being the AC Hotel by Mariott. It is only a couple of blocks from the station. Within another couple of blocks there is a Hampton Inn, Homewood Suites and Drury Plaza Hotel. All of these appear in Google Maps. I also spoke with a young rider that had located an AirBnB nearby as well. So you have lots of options.
As John W notes there is an REI for bike and camping items just a couple of blocks east of the GAP Trail as it leaves town and crosses the Hot Metal Bridge. You can locate it in Google Maps as well. About 7 miles further on the trail in Homestead, PA there is a large shopping center with a large Giant Eagle grocery, Dick's Sporting Goods, Target and Lowes.
I hope this answers your questions. If not or you need other info about the GAP, just drop another note.