The window of a train is more entertaining than TV - Kirti Solanki

You can't track it, bro
Regular people can't find those test trains
The Zone gives the timetable to the staff and management internally.

If by chance the timetable leaks to the public, they can get an idea of when the trial train will pass through their station since these trains are given high priority on the route.

Ye track karna possible nahi hai
Jaise aam public trial run specials ka pata nahi laga sakti
Wo (Zone) apne crews aur management ko time table dete hai aur baki logo ko nahi.

Agar kisi tarah se time table public ke paas aa jaye, tab log apne ghar ke station se trial special ka approximate samay jaan sakte hai kyun ki ye specials poori route pe high priority milti hai.