All IR train types :
nightjet
Overnight long distance train service with top speed of 200kmph
They will be getting newer dedicated rolling stock. The current one is based on the CityJet stock.
New nightjet
Just nightjet, but with dedicated rolling stock
New CityJet
Fast, long distance day trains with top speed of 230kmph.
New CityShuttle
Faster regional trains which stop at fewer stops. Use LHB coaches. Top speed is 160kmph.
Vande Bharat
Velaro-D
Train 18 Gen2A
New Pendolino ETR610
Premium high speed, long distance intercity train service. Top speed of 320kmph (Velaro-D) or 250kmph (T18 Gen2A and ETR610)
New Rajdhani
Luxurious long distance overnight trains linking major cities to Delhi. Use new rolling stock made by Citrus and Siemens (IR250 trainsets). Top speed is 230kmph.
New InterCity
Fast intercity train service, which is sometimes long distance. Top speed of 200kmph.
Standard trains
Newer LHB coaches
Older non refurbished LHB coaches (this also has newer coaches)
(newer LHB livery, also has Bangladesh coaches because it’s on the Maitree service)
(Old LHB In new livery)
Trains used to meet demand and add capacity and also for special services. Newer LHB trains have top speed of 200kmph and the older ones have a top speed of 160kmph.
CityConnect
Regional EMU trains which connect cities which are close by. They are being replaced by RRTS systems. Top speed is 120kmph.
(RRTS like Delhi RRTS, Bengaluru RRTS, Mumbai RRTS etc.)
(Mumbai RRTS train)
Used rolling stock :
Siemens Vectron AC locomotives | WAP-8 | 230kmph
WAP-7HS AC locomotives | 200kmph
LHB coaches | 160/200kmph
Citrus-Siemens CRF coaches (Class III) | 250kmph
Siemens Viaggio Twin coaches | 200kmph
Citrus-Siemens IR250 locomotive hauled trainset | 250kmph
Siemens Velaro-D high speed EMU trainset | 320kmph
ICF Train18 Gen2 high speed EMU trainset | 250kmph
Alstom ETR610 high speed EMU pendolino trainset | 250kmph
ICF MEMU regional EMU | 120kmph
Citrus IR200-B9 RRTS EMU (The Mumbai RRTS train) | 220kmph
Suburban trains are missing in this post. I’ll edit once it’s are ready.