
GMT - Gross Million Tonne (Statistics in IR)
What is GMT ? 
Gross = Total Load i.e., Carrying Capacity (Tare Load + Payload) 
Million = 10 Lakhs
Tonne = 1000 Kgs 
I.e., 100 Crores Kgs  or 1 Million Tonne 
GMT is a primary performance metric   - serves 3 groups of Railway Statistics in IR Statistics Manual i.e., 1. Economic Statistics 2. Transportation Statistics & 3. Administrative Statistics. 
GMT data of every train on every line  - captured on FOIS / ICMS / CoA
 FOIS stands for Freight Operations Information System 
ICMS stands for Integrated Coaching Management System
CoA stands for Control Office Application
Traffic Density Data (GMT)  - an integral part of Indian Railways IT Systems architecture. 
Why GMT is important: GMT data is a crucial decision criterion for 
Planned Track Renewals 
Preventive maintenance (like periodicity of USFD - Ultrasonic Flaw Detection) 
Riding quality (Track degradation model) 
Effective allocation of rails, track materials & resources, among works/projects under Plan Heads 11 - New Lines, 15 - Doubling & 31 - Track Renewals.
Existing mechanism (up to 2022-23) - calculation of GMT 
Computed by Zonal Railways 
Basis is GTKM & Lead (Kms) 
Manually input in TMS - Track Management System 
 Limitation is for sections with more than 2 lines (i.e., 3rd/4th line), the line wise GMT data is not available.  
New mechanism - from 2023-24 onwards   - calculation of GMT 
Zonal Railways would provide GMT data by May of the following year.  Example: For 2023-24 the data should be available by May 2024 and so on. 
All GMT data in TMS  - sync (API based) with the systems architecture
API stands for Architecture Programming Interface
No physical copies. No manual input in TMS - Track Management System
No signed copies in parallel 
GMT data from FOIS/ICMS/CoA would flow daily into TAMS - Traffic Accounts Management System   ( SMRTI - Statistical Module on Rail Transport Information) 
From TAMS to TMS 
From 2024-25 onwards - GMT data - refined format i..e, Block section wise Line wise  (earlier line was not available) 
Zonal Railways Statistical Units (under PFA)  - issue Monthly & Annual GMT Data
SPOC for Statistical Information Module   - GM/TAMS @ CRIS 
SPOC for input data of FOIS/ICMS/CoA - GM/OR @ CRIS
SPOC stands for Single Point of Contact 
It is calculated for Railway Tracks involving multiple factors and is a complex process. 
It is determined through detailed engineering analysis and simulation. 
GMT Calculated for Railway Tracks involving multiple factors.  These are: 
 Axle Load: Higher axle loads leads to greater wear and tear. 
Train Speed: Higher speeds can cause track degradation. 
Train Frequency: The number of trains passing over a track within specified time (Line Capacity) can affect stress & wear on the track. 
Track structure & Material: Ballasted or non-ballasted track and the material used play a significant role in determining load capacity & maintenance requirements. 
Climate & weather: Extreme temperature or heavy rainfall conditions impact the Track’s durability. 
Track maintenance practices: Frequency of track maintenance influences the overall track performance. 
Note: The above instructions are in supersession of any previous instructions on the subject (GMT) and in the event of conflict with any other instructions / part of any other instructions, the above instructions would prevail. 
Key points -  GMT 
GMT is a primary performance metric   - serves 3 groups of Railway Statistics in IR Statistics Manual i.e., 1. Economic Statistics 2. Transportation Statistics & 3. Administrative Statistics. 
Statistical units in Zonal Railways - under control of PFA 
GMT  - Revised policy   w.e.f 01.4.2024 onwards  (or FY 2023-24 onwards) 
GMT means Traffic Density Data 
GMT data from FOIS/ICMS/CoA would flow daily into TAMS - Traffic Accounts Management System   ( SMRTI - Statistical Module on Rail Transport Information) 
From TAMS to TMS  
No physical copies.  No signed copies.  No manual input in TMS 
From 2024-25 onwards - GMT data - refined format i..e, Block section wise Line wise  (earlier line was not available) 
Zonal Railways Statistical Units (under PFA)  - issue Monthly & Annual GMT Data
SPOC for Statistical Information Module   - GM/TAMS @ CRIS 
SPOC for input data of FOIS/ICMS/CoA - GM/OR @ CRIS 
Abbreviations 
GMT  - Gross Million Tonne
FOIS - Freight Operations Information System 
ICMS - Integrated Coaching Management System
CoA - Control Office Application
USFD - Ultrasonic Flaw Detection
TMS - Track Management System 
GTKM - Gross Tonne Kilometer
API - Architecture Programming Interface
SMRTI - Statistical Module on Rail Transport Information 
SPOC - Single Point of Contact 
CRIS - Centre for Railway Information Systems
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