List of railway electrification systems in the context of "Railway electrification in Great Britain"

Merseyrail is a commuter rail network which serves the Liverpool City Region, and the surrounding areas, in the North West of England. Since 2003, the network has been run as a concession, held by Serco and Transport UK Group.

It was established in 1977, when existing railway lines were connected by constructing new tunnels under Liverpool City Centre and Birkenhead. The network has since been expanded, with new stations built, and electrification of existing lines. Today, Merseyrail serves 69 stations, 67 of which it manages, across two lines – the Northern line and the Wirral line. The network uses 750 V DC third rail electrified lines having 76 miles (122 km) of routes, of which 6.5 miles (10.5 km) are underground. The network uses the Class 777 trains based on the Stadler METRO platform. The network carried 28.3 million passengers in 2023/2024.

The Dublin Area Rapid Transit system (stylised as DART) is an electrified commuter rail railway network serving the coastline and city of Dublin, Ireland. The service makes up the core of Dublin's suburban railway network, stretching from Greystones, County Wicklow, in the south to Howth and Malahide in north County Dublin. The DART serves 32 stations and consists of 53 route kilometres of electrified railway (46 km (29 mi) double track, 7 km (4.3 mi) single), and carries in the region of 20 million passengers per year. In a similar manner to the Berlin S-Bahn, the DART blends elements of a commuter rail service and a rapid transit system.

The DART system was established by Córas Iompair Éireann in 1984 to replace an ageing fleet of diesel-powered locomotives. It was, and still is, the only electric mainline railway in Ireland, and one of two currently operating electric railways, the other being the Luas tram which opened in 2004. Since 1987, the service is operated by Iarnród Éireann, Ireland's national rail operator. Contemporary rolling stock on the DART network is powered by 1,500 V DC overhead lines and uses the 1,600 mm (5 ft 3 in) Irish gauge.