What does it mean train moving in negative direction ?

Does train moving in negative direction mean train moving backwards ?

Please explain following paragraph from High School Physics Book:

"A negative value for the acceleration does not always indicate a decrease in speed.  For example, if the train were moving in the negative direction, the acceleration would be negative when the train gained speed to leave a station and positive when the train lost speed to enter a station."
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Yes, that mean that the train is moving backwards.
negative acceleration means that the train loses speed when moving in forward direction. If you want to keep negative acceleration also after the train stops, then the train must start moving and accelerate in opposed direction

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< Deleted, as already answered and accepted.  Mine explained it mathematically. >
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