Notation
a Parameter in Davis equation (N)
aB Ballast acceleration (m/s2)
aT Train deceleration (m/s2)
A Reference area of train (m2)
AB Ballast area (m2)
Aeq Equivalent leakage area (m2)
ATU Tunnel area (m2)
b Parameter in Davis equation (Nsm−1)
b1 Parameter in Davis equation (Nsm−1)
b2 Parameter in Davis equation (Nsm−1)
B Train cross-sectional area to tunnel cross-sectional blockage ratio
c Parameter in Davis equation (Ns2m−2)
ca Speed of sound in air (ms−1)
CD Drag coefficient
CDB Ballast drag coefficient
CDBO Drag coefficient of bogies
CDNT Drag coefficient of train nose and tail
CDW Contact wire drag coefficient
CD(ψ) Drag coefficient at yaw angle ψ
CDf(ψ) Drag coefficient increment at yaw angle ψ due to increased wheel/rail ...
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