A railway stop is a spot along a railway line, usually between stations or at a seldom-used station, where passengers can board and exit the train. While a junction or interlocking usually divides two or more lines or routes, and thus has remotely or locally operated signals, a station stop does not. A station stop usually does not have any tracks other than the main tracks, and may or may not have switches (points, crossovers). A halt, in railway parlance in the Commonwealth of Nations and Republic of Ireland, is a small station, usually unstaffed or with very few staff, and with few or no facilities. In some cases, trains stop only on request, when passengers on the platform indicate that they wish to board, or passengers on the train inform the crew that they wish to alight. In the United Kingdom, most former halts on the national railway networks have had the word "halt" removed from their names. Historically, in many instances the spelling "halte" was used, before the spelling "halt" became commonplace. There are only two publicly advertised and publicly accessible National Rail stations with the word "halt" remaining: and . In addition there are many other such stops in the UK rail network such as in North Wales, in Shropshire, and in Warwickshire, where passengers are requested to inform a member of on-board train staff if they wish to alight, or, if catching a train from the station, to make themselves clearly visible to the driver and use a hand signal as the train approaches. A number of other halts are still open and operational on privately owned, heritage, and preserved railways throughout the British Isles. The word is often used informally to describe national rail network stations with limited service and low usage, such as the "Oxfordshire Halts" on the Cotswold Line. The title halt had also sometimes been applied colloquially to stations served by public services but not available for use by the general public, being accessible only by persons travelling to/from an associated factory (for example IBM near Greenock and British Steel Redcar– although neither of these is any longer served by trains), or military base (such as Lympstone Commando) or railway yard. The only two such remaining "private" stopping places on the national system where the "halt" designation is still officially used seem to be Staff Halt (at Durnsford Road, Wimbledon) and Battersea Pier Sidings Staff Halt – both are solely for railway staff and are not open to passengers.