"Indian railways" gives two possibilities for BSP

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Note added at 57 mins (2006-02-20 13:13:58 GMT)
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"the propulsion system (any Brake Cylinder Pressure [BCP] on train)."

http://gulliver.trb.org/publications/tcrp/tcrp_rpt_01-b.pdf

"BSP Braking in Series-Parallel configuration "
http://irfca.org/faq/faq-acronym.html

This sounds more likely in your context, but here's the other, just in case...


"These may have various additional markings or serial numbers, e.g. "BSP" followed by a number indicates a loco of the Bhilai Steel Plant"
http://irfca.org/faq/faq-loco2.html

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Note added at 1 hr (2006-02-20 13:35:07 GMT)
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FOUND ANOTHER ONE VERY SIMILAR TO BCP for BSP:
Brake Secondary Pressure
http://acronyms.thefreedictionary.com/Brake Secondary Pressu...

I would increase my confidence level now...

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Note added at 1 hr (2006-02-20 13:39:25 GMT)
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Confirmed by Acronymn Finder....

BSP Brake Secondary Pressure
http://www.acronymfinder.com/af-query.asp?acronym=BSP&String...

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Note added at 1 hr (2006-02-20 13:41:07 GMT)
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So, my new entry is:
BCP: Brake Cylinder Pressure
BSP Brake Secondary Pressure :-)