The 2025 Omega Seamaster Railmaster is a 38 mm stainless steel time-only watch with anti-magnetic movements. The case is shared with the Seamaster Aqua Terra. It measures 38 mm across, 44.92 mm lug to lug and 12.36 mm thick, with 19 mm between the lugs, twisted lugs, brushed and polished surfaces and a screw-down crown. A domed sapphire crystal with anti-reflective treatment on both sides covers the dial, and a sapphire case back shows the movement. Water resistance is 150 m. The reference 235.12.38.20.06.001 has a grey dial that darkens to black at the edge, with white Super-LumiNova numerals and indexes. It uses the Co-Axial Master Chronometer calibre 8806, which runs at 25,200 vph (3.5 Hz) with 35 jewels and a 55-hour power reserve. The small-seconds version uses calibre 8804. Both movements are METAS-certified and resist magnetic fields of 15,000 gauss.

The original Railmaster of 1957 belonged to Omega’s Professional trilogy alongside the first Speedmaster and Seamaster 300. It was built for railway workers and engineers and used an inner shield to resist about 1,000 gauss. The grey centre-seconds dial comes on a black leather strap (235.12.38.20.06.001) or a steel bracelet (235.10.38.20.06.001). The beige-to-brown gradient dial with small seconds at 6 o’clock and vintage-toned lume comes on a brown leather strap (235.12.38.20.13.001) or a bracelet (235.10.38.20.13.001). The three-row bracelet has a butterfly clasp with toolless micro-adjustment. Launch prices were USD 5,400 for grey on leather, USD 5,800 for grey on bracelet, USD 6,000 for beige on leather and USD 6,400 for beige on bracelet. Omega US now lists the grey leather model at USD 5,800.

Reception was mostly positive about the dials and size, with recurring criticism of how closely the watch follows the Aqua Terra. Hodinkee called it a stronger, more conventional offering than the previous generation and said the grey dial felt like a modernised version of the original Railmaster. It also suggested a broad-arrow hour hand and fully brushed bracelet would help it stand apart from the Aqua Terra it is based on. Fratello’s hands-on praised the gradient dials and the micro-adjust bracelet. Several Fratello readers called it a lazy release with too many polished surfaces for a tool-watch heritage. As of October 2026 all four references remain in Omega’s catalogue and are in production.