Chunnel Train Speed: 69 Miles in 35 Minutes ≈ 118 mph

Eurostar trains traversing the Channel Tunnel cover the undersea section (approx. 39 km / 24 mi) at up to 160 km/h (100 mph) for safety and pressure reasons. However, the overall journey between London St Pancras and the French portal (or Calais-Fréthun) involves high-speed lines where trains reach 300 km/h (186 mph).

Your Specific Calculation

If a train travels 69 miles in 35 minutes:

• Time in hours: 35 ÷ 60 = 0.5833 hr
• Speed = Distance ÷ Time = 69 ÷ 0.5833 ≈ 118.3 mph (190 km/h)

This average speed is plausible for a segment mixing high-speed line and tunnel approach, or a non-stop run between specific intermediate points.

Typical Eurostar Speeds

• HS1 (UK): 300 km/h (186 mph)
• Tunnel: 160 km/h (100 mph)
• LGV Nord (France): 300 km/h (186 mph)
• London–Paris average: ~145 mph (233 km/h) including stops

So 118 mph is a reasonable average for a 69-mile segment that includes tunnel or station approach zones.