Boston Lodge

This article is about the locomotive works. For the station see Boston Lodge Halt.

Boston Lodge is situated at Penrhyn Isa, Minffordd, Penrhyndeudraeth, on the A487 road about 1 mile SE across the Afon Glaslyn causeway from Porthmadog, Gwynedd in north-west Wales.

It has a station on the Ffestiniog Railway and is the location of the railway's main engineering workshops, locomotive shed and carriage works. The Boston Lodge address and postcode is shared by the works with four cottage dwellings (mostly occupied in connection with the railway) and with the former tollgate cottage at the end of the causeway. The original 'Penrhyn Isa' cottage (now the railway works office) was renamed 'Boston Lodge' after Boston, Lincolnshire, the parliamentary seat of William Madocks, the proprietor of the land reclamation venture.

Construction of the causeway, known locally as ‘The Cob’, linking Penrhyn Isa on the Merioneth shore with the small rocky island called Ynys Towyn (where Britannia Terrace now stands in Porthmadog) near the Caernarfonshire shore, started in 1807 and was completed in 1811 during which time large quantities of stone was quarried and extracted from both ends. The embankment, which was the final stage of the Traeth Mawr land reclamation scheme, was 24 feet (7.3 m) wide at the top (where the railway now runs), 180 feet (55 m) wide at the base, 21 feet (6.4 m) deep and about 1 mile (1.6 km) in length. The quarrying created both the Britannia Terrace site at Porthmadog and the railway workshops site at Boston Lodge.

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