3.2 Classification of Tracks, Stations and Signals 45 is an essential difference from European signalling). These signals are called home signals. A speed indication at an interlocking signal applies until the train has passed the first opposing interlocking signal, which is called the exit signal of that interlocking. On European railways, there is still a difference between the traditional British practice and the continental railways that followed more the German principles. In traditional British interlocking systems, there are designated ‘station limits’. Station limits are the tracks between the home signal and the last main signal of the same direction (the section, or starting signal), controlled from the same signalbox (interlocking station). The section signal permits trains to leave the station limits and enter the next block section. There are different station limits for each direction. In most British installations, this signal is placed behind the last points of the interlocking (then also called an advance signal or formerly an advanced starter signal), thus usually requiring additional interlocking signals before the points (figure 3.5). Figure 3.4: Interlocking limits (North American practice) Figure 3.3: Different principles of assigning interlocking and station names to a track layout on North American and European railways
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