Booking from an intermediate station? Your Tatkal opens earlier than you think

Here's a mistake that costs people their Tatkal tickets every single day, and almost nobody talks about it:

The 60-day and Tatkal booking windows are counted from the train's departure at its originating station — not from your boarding date.

If you board at an intermediate station on a long-distance train, booking opens earlier than "one day before you travel." Miss this, and you show up to Tatkal a day or two too late, and the train is gone.

A real example: Kerala Express at Salem

The Kerala Express (12626) runs New Delhi → Thiruvananthapuram — one of India's longest routes, about three days end to end.

• Day 1: departs New Delhi
• Day 2: passes through Nagpur, Vijayawada
• Day 3: reaches Salem (Tamil Nadu)

Now say you're boarding at Salem. Your boarding date is, let's say, 15 September.

The wrong way to think about it:

"Tatkal opens one day before I travel, so it opens on 14 September at 10 AM."

The correct way:

The train left New Delhi on 13 September (two days before it reaches Salem on the 15th). Tatkal opens one day before the train departs its origin — so it opens on 12 September at 10 AM.

That's two days earlier than most people expect. If you log in on the 14th, every Tatkal seat is long gone.

The same logic applies to the 60-day general window: it's counted from the 13 September origin departure, so booking opens on 15 July, not 17 July.

Why IRCTC works this way

A train is one continuous service. When reservations open, they open for the entire run of that train on a given origin-departure date — all coaches, all segments, from the first station to the last. The system anchors everything to when the train starts its journey from the source station.

So the "60 days" and "1 day" are always measured backwards from that origin-departure date. For a passenger boarding near the origin, this is the same as their boarding date — no difference. But the further down the line you board, the bigger the gap.

How to calculate it yourself

1. Find your train's origin station and the day-number on which it reaches your boarding station. (Day 1 = the day it departs origin.) This is printed on every train schedule — check enquiry.indianrail.gov.in or the train's timetable.
2. Work out the origin-departure date: origin departure = your boarding date − (day number − 1)
3. Apply the rules to that origin date:
   • 60-day window opens: origin departure − 60 days, at 8:00 AM IST
   • Tatkal opens: origin departure − 1 day (10:00 AM AC / 11:00 AM Sleeper)

For Salem on the Kerala Express (Day 3), boarding 15 September:

• origin departure = 15 Sep − 2 = 13 Sep
• Tatkal opens 12 Sep, 60-day window opens 15 Jul

The easy way

Manually counting day-numbers and subtracting is exactly the kind of error-prone math that makes people miss bookings. So we built it into the tool.

On irctcwhen.in, switch to "By train no." mode:

1. Enter your train number (e.g. 12626)
2. Pick your boarding station from the list — it shows the day-number for each stop
3. We compute the correct origin-anchored opening date and time automatically, and can remind you the morning it opens

No counting, no mistakes, no missed Tatkal.

Which trains does this affect most?

The gap only matters on multi-day, long-distance trains where you board well past the origin. The big ones:

• Kerala Express (Delhi ↔ Trivandrum)
• Himsagar Express (Katra ↔ Kanyakumari) — India's longest single-train route, ~4 days
• Navyug Express, Vivek Express, Ten Jammu / Jammu Tawi expresses
• Most Delhi ↔ South India trains for southern boarding points
• Long Rajdhani / Duronto / SF runs where you board mid-route

For short-distance trains and passengers boarding near the origin, your boarding date is the origin date — nothing changes, and plain "By date" mode is exactly right.

Quick reference

Bottom line

• IRCTC's booking windows count from the train's origin departure, not your boarding date.
• On long-distance trains, your Tatkal (and 60-day window) opens earlier than "one day before you travel" — by however many days the train has been running before it reaches you.
• Counting this by hand is where people slip up and miss the slot.
• Use "By train no." mode at irctcwhen.in — pick your train and boarding station, get the exact origin-anchored date, and set a reminder so you're there the moment it opens.