small coloured lights on engines

Hello

Which meaning does these small coloured lights on engines have? (red, white and blue)
Mainly seen on canadian engines
example : http://www.railpictures.net/viewphoto.php?id=10608

On new engines it seems that only the red light remained.
example : http://www.railpictures.net/viewphoto.php?id=131144

The red lights are rear end markers, if the enigne push the train as a DPU?
But what does the blue and the addiontal white lights show?

Greets

Those are called class lights and are Red(markers) for pushers or light engines.
White and Green are used to denote extra sections of trains in Manual block.

DutchRailnut wrote:Those are called class lights and are Red(markers) for pushers or light engines.
White and Green are used to denote extra sections of trains in Manual block.

To add to Mr.Nut's response
White=Extra train. Not a regular freight or passenger train on the (employee)timetable.
Green=Extra section of a regular scheduled freight or passenger train.

In Canada, class lights are no longer used since all trains are considered extras now, even though passenger trains have a public timetable. I suspect it is the same for the USA.

ENR, you're close but just a little off on the green lights. Green lights (or green flags by day) meant that there was another section of that train following. If you had orders to meet #54 at a certain place, and the train was showing green lights, you had to stay there until the following section (or sectionS) had passed. The last section would NOT be wearing green, thereby indicating there were no further sections of that train behind.

There were several other things involved as well - for instance the train which was carrying green was required to whistle a long and two short when meeting another train. That called attention to the fact that there was another section following. If the train being met did not acknowledge, the first train was supposed to stop.

The idea was that a train extended from the front of the first section to the markers of the last section. If you were supposed to meet #54 at some station, that meant ALL sections of #54 unless you had specific orders to the contrary. (Extra 5234 west meet First 54 eng 1234 at A and second #54 eng 9876 at B) In that case you only had to wait at A for First 54.

Aji-tater wrote:ENR, you're close but just a little off on the green lights. Green lights (or green flags by day) meant that there was another section of that train following. If you had orders to meet #54 at a certain place, and the train was showing green lights, you had to stay there until the following section (or sectionS) had passed. The last section would NOT be wearing green, thereby indicating there were no further sections of that train behind.

I stand corrected.