The patented type of tandem compound cylinders were arranged outside the bar frame.
2.
Early Mallet locomotives had compound cylinders, so high pressure steam was provided to the rigid power unit, while the front cylinders ( requiring flexible steam pipes ) received low pressure steam.
3.
Whether the above locomotive is, strictly speaking, a compound is subject to debate : the first recognisable compound application to a locomotive was on Erie Railway's No 122, an ordinary American type fitted in 1867 with tandem compound cylinders following J . F . Lay's patent no . 70341.
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