2. PLAN OF ATTACK
Alignments:
1 – Flat profile, no regeneration
2 – Hump profile, no regeneration
3 – Flat profile, with regeneration
4 – Hump profile, with regeneration
Track sections:
1 – Accelerate to max speed
2 – Maintain max speed
3 – Decelerate to rest
Thong, M and Cheong, A. 2012. Energy Efficiency in
Singapore’s Rapid Transit System. Journeys, 2012, 39,44-45.

3. ELECTRIC-POWER BASED APPROACH
Alignment 1 – Section 1
0
1000000
2000000
3000000
4000000
5000000
6000000
0 5 10 15 20 25
Power(watts)
Time (s)
Traction Power vs Time

4. COMPARE THE PAIR
Newton’s Second Law:
𝑭 = 𝒎𝒂

5. REGENERATIVE BRAKING
Graph supplied by MMJong, J and Chang, E. 2005. Models For Estimating Energy Consumption
Of Electric Train. Journal of the Eastern Asia Society for Transportation
Studies, 2005, 283.

6. SUMMARY OF RESULTS – ENERGY USAGE
Alignment Section 1 Section 2 Section 3 Auxiliary
Load
Overall
Energy
Input
1 Flat 113.6 7.0 0 62.9 183.5 MJ
2 Hump 75.4 7.0 0 62.9 145.3 MJ
3 Flat, regen 113.6 7.0 -85.0 62.9 98.5 MJ
4 Hump, regen 75.4 7.0 -56.2 62.9 89.1 MJ