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Train windows

Understanding NJ TRANSIT Rail Car Window Issues

At NJ TRANSIT, we are dedicated to ensuring a comfortable, safe, and pleasant travel experience. One issue that has affected some of our trains is the appearance of cloudy or foggy windows, which can reduce visibility and impact your ride. We recognize how important this is to the quality of your commute. This page explains why this happens, particularly with single-pane polycarbonate windows, and details our plan to address the issue.

Why Do Some Train Windows Become Cloudy?

Several factors can cause windows on our trains to become cloudy over time. In many cases, this is due to the long-term effects of UV light exposure and environmental conditions on single-pane polycarbonate glazed windows, which are the types of windows used on NJ TRANSIT trains and are standard in the transit industry.

Here's why:

  • Polycarbonate Material: Many train windows use polycarbonate, a strong, lightweight plastic known for its durability and impact resistance. However, unlike glass, polycarbonate is more susceptible to certain types of wear.
  • UV Light Exposure: Constant exposure to ultraviolet (UV) light from the sun can cause the surface of polycarbonate windows to degrade. Over time, this can lead to a cloudy or hazy appearance due to the breakdown of the material.
  • Scratching and Abrasion: Polycarbonate, while durable, can also accumulate scratches and abrasions from dust, debris, and frequent cleaning. These micro-scratches contribute to the window's opaque or dull look over time.
  • Weather and Temperature Fluctuations: As our trains operate year-round, windows are exposed to extreme temperature changes. The expansion and contraction of materials during hot summers and cold winters can accelerate the aging process, further reducing clarity.


NJ TRANSIT’s Plan to Replace Cloudy Windows

We recognize the importance of clear, transparent windows for an enjoyable ride, and we are taking steps to replace and upgrade cloudy windows across our fleet. Here's how we're addressing the issue:

  • Prioritized Replacement Schedule: The first 400 windows have been ordered and replacement will begin over the next few months as those windows arrive, and railcars come in for scheduled inspections.
  • Comprehensive Fleet Assessment: Our maintenance teams are performing a full assessment of all windows in the fleet, identifying those in need of immediate replacement and planning for future replacements as part of ongoing maintenance cycles.
  • High Quality & Protection: The new windows will feature the following:
    • High optical clarity
    • Excellent UV resistance
    • High resistance to scratches, abrasions, vandalism & chemicals
    • Virtually unbreakable

Cloudy windows not only reduce visibility but can also diminish your overall ride experience. NJ TRANSIT’s replacement plan will improve window clarity, allowing for better views and a more aesthetically pleasing journey. We appreciate your patience as we continue to make these improvements.