Atlas Master 20007285 HO Scale Gunderson 7550 Boxcar (GATX) UP BKTY 157617Atlas Master 20007285 HO Scale Gunderson 7550 Boxcar (GATX) UP BKTY 157617 In 2012, BNSF acquired close to 600 Gunderson 7538 High Capacity box cars. Four years later, TTX Corporation placed orders for a similar 7550 box car. At this time, they have over 4,000 cars in their fleet with more cars ordered. With a gross rail load capacity of 286,000, these cars can carry a wide variety of products such as paper and bulk items. While they look similar in