Elevation data for ELR HLL2 is based on LiDAR surveys sampled at 100 metre intervals. The elevations (in metres, relative to mean sea level) are an indication of the ground level from an aerial perspecitve and don’t specifically relate to the railway track level.

MileageElevationProfileFeatures
19.861km30.97|||||||||Heathrow Tunnel Jn
19.916km34.10||||||||||||
20.015km35.57||||||||||||||
20.117km35.37|||||||||||||
20.216km34.18||||||||||||
20.318km32.76|||||||||||
20.419km30.44|||||||||
20.518km28.82|||||||
20.620km28.95|||||||
20.719km29.15|||||||
20.821km32.44|||||||||||
20.920km29.33|||||||
21.021km28.92|||||||
21.123km28.48|||||||
21.222km28.39|||||||
21.324km29.36|||||||
21.423km27.89||||||
21.524km27.28|||||
21.626km26.64|||||
21.725km26.81|||||
21.827km27.47||||||
21.926km26.38||||
22.027km25.83||||
22.128km26.04||||
22.228km25.96||||
22.329km25.89||||
22.429km25.10|||
22.530km24.57|||
22.631km23.86||
22.731km23.73||
22.832km23.52||
22.932km23.96||
23.033km23.57||
23.134km23.23|
23.234km23.35|
23.335km23.27|
23.435km23.81||HEATHROW T2 T3
23.536km23.93||HEATHROW T2 T3
23.637km24.42|||
23.737km24.11||
23.838km23.90||
23.939km23.66||
24.039km23.19|
24.140km23.09|
24.240km23.07|
24.341km22.88|
24.442km23.40||
24.542km23.23|
24.643km23.01|
24.743km23.57||
24.844km23.45||
24.945km23.25|
25.045km24.16||
25.146km24.93|||
25.246km24.57|||
25.347km24.20||
25.448km24.07||
25.547km24.97|||
25.649km24.32||
25.750km24.89|||
25.850km24.19||
25.951km24.80|||HEATHROW T5
26.050km24.90|||HEATHROW T5
26.152km24.38||
26.251km24.08||
26.306km26.57|||||