A close-up view of a Southern Railway Class 377 Electrostar unit, part of the modern suburban fleet serving routes across South London and the southern counties. The green and yellow livery, with sliding central doors and Wi-Fi signage visible through the window, reflects the operator’s current design standard for high-frequency commuter service. These electric multiple units, built by Bombardier, form the backbone of Southern’s network—efficiently linking London with Brighton, Gatwick, and the South Coast. The clean, modular profile emphasizes function and accessibility typical of post-2000 British rolling stock.