Topup seems not possible for all passenger trains at Karwar. Most case only 1-2 possible.
Karwar doesn't have stabling lines, but It does have one Half length siding, where unloading Goods happens 2-3 times a month. & due to half length results in Main line getting blocked too @ that time.
Rest...
more... of times Track machines, RMV etc. get stabled there along with Pernem DEMU at Night.
At present, If Topup is thought seems feasible only between Ratnagiri & Madgaon or Either Commission Electrification fully at one go as work is progressing in good pace.