LB&SCR
Marsh succeeded R.J. Billinton as the Locomotive, Carriage and Wagon Superintendent at Brighton Works on 23 November 1904. Marsh's locomotive classes included two designs of Atlantic 4-4-2 (H1 Class and H2 Class), and four designs of 4-4-2T (I1, I2, I3, and I4). In 1910 he designed two 4-6-2T tank locomotives of the J1 and J2 classes. His least successful design was the LB&SCR C3 class 0-6-0 freight locomotives. Marsh also rebuilt many of his predecessors' locomotives with larger boilers thereby creating the A1X, B2X, C2X, E4X, E5X and E6X classes. In 1907 he introduced an example of the Schmidt superheater on one of his LB&SCR I3 class locomotives, with dramatically improved results. Whilst at Brighton he abolished the Stroudley yellow livery for passenger locomotives and removed the names from them.
During Marsh's period in office Brighton railway works built up a serious backlog of locomotives awaiting repair, and by 1910 30% of the locomotive stock was unusable. Marsh received a lot of the blame for this situation although it was partly because the works was overwhelmed with work.
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