Port Terminal Railroad Association
The Port Terminal Railroad Association (PTRA) is an American terminal railroad that operates 154 miles (248 km) of track at the Port of Houston in Houston, Texas.

Port Terminal Railroad Association Overview
Reporting mark: PTRA
Locale: Port of Houston
Dates of operation: 1924–present
Track gauge: 4 ft 8 1⁄2 in (1,435 mm) standard gauge
Headquarters: Houston, Texas

See also:

Common Carrier Freight Railroads

Railroads of the U.S.A.

Historic Rail - Shop Now!
A PTRA train in 2016, crossing one of two surviving swing bridges over Buffalo Bayou in Houston.
Enter the Classic Streamliners Bookstore.
NFLShop.com - NFL Jerseys and Gear
Shop for Railroad and Train Collectibles on eBay

A Port Terminal Railroad Association (PTRA) train crossing the ex-HB&T Railway swing bridge over Buffalo Bayou near Hedrick Street, in Houston, Texas. This bridge is one of two surviving ex-Houston Belt & Terminal Railway swing bridges over Buffalo Bayou in Houston, the other being located upstream (to the west).    Patrick Feller from Humble, Texas, USA [CC BY 2.0 (https://creativecommons.org/licenses/by/2.0)]

NFLShop.com - NFL Jerseys and Gear
Enter the Classic Streamliners Bookstore.
Shop for Trains and Railroad Collectibles on eBay

Classic Streamliners - TRAIN​CYCLOPEDIA