11. A " Delta " type trailing truck , fabricated using a one-piece casting by Commonwealth Steel Co. 12. The following January, it was back in the shop to receive a booster engine on its trailing truck . 13. Even the pilot wheels and trailing truck were removed, making it an oversized 0-8-0. 14. The two wheel trailing truck enabled the fitting of a wide firebox, necessary for a coke burning locomotive. 15. This necessitated the addition of a trailing truck to support the additional weight at the rear end of the locomotive. 16. The successful design of a trailing truck with the firebox mounted behind the driving wheels had not yet been developed. 17. A Berkshire type was the first of the booster on the trailing truck , roller bearings, and so forth. 18. In addition to supporting the very large firebox and grate, the four-wheeled trailing truck carried the ash pan. 19. A much larger cab was fitted, and a fuel bunker and water tank behind the cab, supported by a trailing truck . 20. It still betrayed its foreign heritage by lacking the PRR trademark Belpaire firebox and by having a booster engine on the trailing truck .
