For Trivandrum Central:
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Sir no need to worry. There is wheel chairs available with the station master's office and also no need to worry about the stairs as platform 1 is connected with all platforms with a ramp at one end.
If you are comming in Island express , what i have seen is that Island arrives on either platform 1 or...
more... 3. If its in 3, you can avail the services of a porter to get the wheel chair. If need any help, you can send me a PM.