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It's worth pointing out that steam loco lamps were not actually lit in daylight anyway. And 1970s marker lights were barely visible in daylight. The tail lamp has 2 purposes : to indicate the train is complete to signalmen at each block post and other railwaymen(if there's no tail lamp on the last vehicle then it shouldn't be the last vehicle , and the code "train divided in section" is sent to the adjacent signal box to stop following trains), and as a last line of defence at night if the train is halted on the line

With steam engines, the sheer sound of the blast (coupled with a very visible smoke plume) served as an added warning of arrival. When deisels appeared in the mid 50s , it was rapidly found that there was a potential problem (especially with green diesels running through the country between hedges). Hence the introduction of the yellow warning panel on the front from 1960 onwards, originally small then fron the mid 60s covering the whole end. Only recently has the requirement that the whole front be yellow been slightly eased (which is why Eurostars have yellow noses) In the brief period when SNCF electrics with suitable signalling equipment worked through the Tunnel to Dollands Moor yard , the SNCF had to paint the lower cab ends yellow

The basic principle in Britain is that no-one and nothing should be on the line. The farmer and the railway are responsible for keeping all fences stock proof and anyone other than railways staff walking along the line is committing a criminal offense
 
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