The life as a train

I am a train

I have a start and an end station

Each station I come to some enter and some leave, 

some may even stay all the way

I am never empty, yet there's always something missing. 

I am a train

I am filled, yet nothing changes my pace. 

My tracks are straight, I have only one way to go. 

I am a train

A shell, inhabited by others. 

Without them I'm nothing. 

One thing troubles me, what will happen at the end station? 

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