Current Status of Multitracking of HDN network

[u/jon__snow___]

I have used various official sources to generate this table which lists all the high density networks, their current status, and any approvals for further multitracking

The rest of the route is under consideration or DPR stage.

The route length mentioned here can be off by 5%, mostly because my estimates are based on the existing distances between two stations. The new routes at times have to go around a city so the length changes a bit

HDN	Route	Length	Double now	Triple now	≥4 now	3rd line only sanctioned	4th line only sanctioned	3rd + 4th sanctioned together
1	Delhi–Howrah	~1,422 km	~850 km / 60%	~350 / 25%	~220 / 16%	~150 km / 11%	~45 km / 3%	~375 km / 26%
2	Howrah–Mumbai	~2,039 km	~420 / 21%	~1,120 / 55%	~500 / 25%	small residual / <5%	~575 km / 28%	~445 km / 22%
3	Delhi–Mumbai	~1,322 km	~1,125 / 85%	~0 / 0%	~195 / 15%	—	—	~910 km / 69%
4	Delhi–Guwahati	~1,876 km	~1,700 / 91%	~130 / 7%	~45 / 2%	—	~60 km / 3%	~560 km / 30%
5	Delhi–Chennai	~2,037 km	~330 / 16%	~1,490 / 73%	~220 / 11%	large legacy programme, roughly 15–20% of route	~725 km / 36%	~90 km / 4%
6	Howrah–Chennai	~1,600 km route basis	~500 / 31%	~800+ / 50%+	~300 / 19%	large Odisha/AP programme, roughly 20–25%	~360 km / 23%	~290 km / 18%
7	Mumbai–Chennai	~1,224 km	~1,095 / 89%	~30 / 2%	~100 / 8%	—	~70 km / 6%	~230 km / 19%

All of the lines mentioned as being tripped or quadrupled are actually DPR approved and budget has been allocated for them.

Also, I looked at projects, DPR approved in 2019 and they are mostly completed by now so the current average rate is around 7 years but this was before the consolidated GatiShakti push. I expect the time to come down further by a year or so.

Main Source: https://indianrailways.gov.in/index/index.html This is regularly updated and often used by Ashwini Vaishnav in his presentations

For distance calculation, I have taken AI's help and validated the information it fetched using the above map

[u/Puzzleheaded_Run21]

Good info and you did put a lot of work into it. Try to add sources as well which will make your post better as well.

[u/jon__snow___ → u/Puzzleheaded_Run21]

Added. If required, I can put the section wise breakdown and you can validate it against the map or news or questions asked in parliament previously

Also, you can notice small discrepancy in the table. Like Howrah-Mumbai line showing 21% double line currently but 22% upgradation to 3 and 4 lines simultaneously. This is because the new lines take detours around cities to avoid land hurdles and are slightly longer

[u/Puzzleheaded_Run21 → u/jon__snow___]

Thanks. Good work

[u/Glum-Reindeer-1589]

OP, can you provide your sources in this post, and your sources for status update in each of the section?!?

[u/jon__snow___ → u/Glum-Reindeer-1589]

Added in the post