Alligator v the 3-Bar Overhead Slidebar arrangement

Alligator v the 3-Bar Overhead Slidebar arrangement

This topic has 1 reply, 2 voices, and was last updated 29 May 2025 at 22:56 by duncan webster 1.

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29 May 2025 at 21:41 #800470
Greensands
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@greensands
Can somebody offer some words of wisdom in the design considerations for selecting the type of slide bars used in steam locomotives, namely the alligator deign as used by the GWR and some of the smaller BR Standards viz the triple surface overhead arrangement as used on the LNER and the larger BR Standards. Would it be correct to say that the alligator design was the preferred option for tank engine design when duty cycles required equal running in both directions and the overhead design used for passenger locomotives when running was predominantly in the forward direction?
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29 May 2025 at 22:56 #800480
duncan webster 1
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@duncanwebster1
3 bar is lighter so less balance problem, but doesn’t work as well in reverse
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