to the East Midlands and South Yorkshire. Great Western: Services on the Great Western Main Line from London Paddington to South Wales and the West Country, including overnight sleeper services to the West Country. Great Eastern: Services on the Great Eastern Main Line from London Liverpool Street to Essex and East Anglia. Cross-Country: Services between city pairs that used a combination of the various main lines, but usually avoided Greater London; many of these served the Cross-Country Route. Gatwick Express: Shuttle service between London Victoria and Gatwick Airport. The InterCity sector was also responsible for Motorail services to and from London Kensington Olympia. Operations InterCity operated High Speed Trains (HST) under the brand-name InterCity 125, as well as InterCity 225s for the electric high-speed trains operated on the East Coast route. The "125" referred to the trains' top speed in miles per hour (mph), equivalent to 201 km/h, whereas "225" referred to the intended top speed in km/h (equivalent to 140 mph) and for signalling reasons their actual speed limit was the same 125 mph. InterCity 250 was the name given by InterCity to the proposed upgrade of the West Coast Main Line in the early 1990s. The existing trains operating on the West Coast were intended to be marketed under the brand InterCity 175, again referring to those trains' top operating speed of 110 mph, roughly equivalent to 175 km/h, although this idea was subsequently dropped. All InterCity day services ran with a buffet car and the majority ran at speeds of 100 mph or above. If expresses on other sectors are included, there was a period in the early 1990s when British Rail operated more 100 mph services per day than any other country. Special discounted fares, including the Super Advance and the APEX, were available on InterCity if booked ahead. Rolling stock HST services were first introduced in 1976 on the Great Western Main Line from London Paddington to Bristol, Cardiff and Swansea. Formations consisted of 2 first-class, a Restaurant Buffet and 4 standard-class Mark 3 carriages with a Class 43 power car at each end. East Coast – InterCity 125 HST services started in 1977: Typically 2 first-class, a Restaurant Kitchen, Buffet Standard and 4 standard-class British Rail Mark 3 carriages with a Class 43 power car at each end. These progressively replaced Class 55 "Deltics" which were finally withdrawn in 1981. Later, as catering needs