Automatic block signalling cannot pause for a power cut. A backup system that degrades quietly between inspections is worse than none, because nobody finds out until the grid drops.
A comprehensive backup solution for critical Southern Railway loads.
Automatic block signalling — uninterrupted operation during power outages
Southern Railway's automatic block signalling at this location holds through a seven-hour outage on a 2 kWh draw, against a grid interruption that rarely runs that long.
The more useful outcome is that the system's condition is now known rather than assumed. The BMS reports state of charge and cell health continuously, so the question an inspection used to answer badly — is this bank still capable of carrying the load — is answered on a screen, before it is tested by a power cut.
See the Railways battery range and specifications
Enough to carry the signalling load through the longest credible outage, with certainty rather than nominal capacity. This installation pairs a 10 kW SMPS power plant with 14.4 kWh of lithium storage, giving seven hours against a 2 kWh load — several times the typical interruption.
Predictability. A lead-acid string degrades invisibly: it holds float voltage while its real capacity falls, so it can pass an inspection and still fail under load. LFP reports actual state of health through its BMS, and holds voltage flat through the discharge instead of sagging as it empties, which matters for equipment that expects a stable supply.
CLN Energy has supplied lithium battery systems to Indian Railways for signalling power backup, and to RailTel Corporation for data centre backup at its Integrated Command Control Centre. Both are live installations.
The constraint is rarely the equipment; it is working around live signalling without interrupting it. This installation was completed in 2025 with the section in service throughout.
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