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Is P2A Enough for EMU Pantograph Camera Glass?

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This article explains why P2A can be used as one reference for pantograph camera glass, but why I believe 370 km/h gravel impact testing is more relevant for EMU pantograph cameras used in real railway operating conditions.

The key evidence: our EMU pantograph camera glass passed a 370 km/h gravel impact performance test with no penetration, based on TB/T 1451-2017, Clause 6.8.5.

This article is written for railway system integrators, rolling stock manufacturers, engineering consultants, train CCTV contractors, and railway security solution providers who need reliable pantograph monitoring camera solutions.

A customer recently asked me: “Does your pantograph camera glass meet P2A?”

It is a fair question.

But for a roof-mounted EMU pantograph camera, is P2A the real benchmark?
Or should we ask a more practical question: can the glass survive the impact risk it actually faces on a high-speed train roof?

Brief Answer

P2A is useful, but it is not enough to evaluate EMU pantograph camera glass.

For railway use, I care more about real operating conditions: high speed, vibration, weather exposure, and gravel impact.

Our EMU pantograph camera glass has passed a 370 km/h gravel impact performance test. The result was clear: glass cracked, but no penetration; test passed. 

That gives railway buyers a stronger project reference than only checking a general glass protection class.

What does P2A really tell you?

P2A is a glass resistance classification under EN 356, commonly used for security glazing and manual attack resistance. In the P-A group, the test method uses a 4.11 kg steel ball dropped onto the glass, and the requirement is that the ball must not pass through the pane. 

From my experience, P2A can be useful when buyers want a basic reference for glass protection.

But a pantograph camera is not installed in a building.

It is installed on the roof of an EMU or high-speed train.

That means the glass is exposed to a very different risk profile:

• high-speed airflow

• vibration

• rain and dust

• temperature changes

• stone or gravel impact

• long-term outdoor railway operation

So I do not reject P2A.

I just do not treat it as the final answer for railway applications.

For pantograph camera glass, the real question is not only “What class is the glass?”

The better question is: Can the glass protect the camera under real railway operating conditions?

Why is 370 km/h gravel impact testing more relevant for EMU pantograph cameras?

For EMU pantograph cameras, I believe 370 km/h gravel impact testing is closer to the real operating concern.

The camera is mounted on the train roof.

The glass is the first protection layer for the optical window.

If a hard object hits the glass at high speed, the camera still needs to protect the lens and maintain system integrity.

• The test was carried out according to TB/T 1451-2017, Clause 6.8.5.

• The projectile was a 20.3 g aluminum body.

• The impact point was the center of the glass.

• The test result showed:

   Glass cracked

   No penetration

   Test passed

For a railway system integrator, this result is practical.

It does not just say the glass has a general protection level.

It shows that the glass was tested against a railway-relevant impact condition.

That is why I position this as performance beyond P2A concern.

What does “no penetration” mean for system integrators?

For a railway system integrator, “no penetration” is not just a test phrase.

It means the glass helped stop the projectile from passing through the optical window area.

That matters because the camera glass protects more than the glass itself.

It protects the camera lens, internal module, image window, and the monitoring function.

In real projects, a failed camera glass can create several problems:

• blocked camera view

• reduced image clarity

• possible monitoring interruption

• increased maintenance pressure

• higher project risk after installation

This is why I always tell buyers to look beyond surface-level specifications.

A low-cost camera glass may look acceptable on paper.

But if it cannot handle real railway impact risk, the total cost can become much higher later.

For pantograph monitoring, stable visibility is critical.

If the camera cannot see clearly, the monitoring system loses value.

How should buyers evaluate pantograph camera glass before RFQ?

Before RFQ, I suggest buyers evaluate pantograph camera glass from real project risk, not only from a single certificate or class name.

This is especially important for system integrators, train contractors, and rolling stock manufacturers who need to reduce technical risk before submitting their solution.

Here is the checklist I recommend:

1. Ask where the camera will be installed.
For roof-mounted pantograph cameras, the environment is much harsher than indoor or carriage-side equipment.

2. Ask what impact test was done.
Do not only ask whether the glass meets P2A. Ask whether it has passed a railway-relevant impact test.

3. Ask for test conditions.
For example: test speed, projectile weight, impact point, temperature condition, and test standard.

4. Ask for the actual result.
“Passed” is not detailed enough. Ask whether the glass cracked, whether penetration occurred, and whether the camera protection function remained acceptable.

5. Ask whether the supplier can customize.
Railway projects often have different installation interfaces, housing structures, sealing requirements, connector requirements, and project documentation needs.

This is where we add value.

At TIENUO, we support customized railway camera solutions for pantograph monitoring, train CCTV, and onboard safety systems.

Conclusion

For EMU pantograph camera glass, I do not believe P2A should be the only evaluation point.

It can be a reference.

But railway roof-mounted equipment needs to be judged by railway operating risk.

Our EMU pantograph camera glass passed a 370 km/h gravel impact performance test with no penetration. That is the key point I want buyers to understand. 

For system integrators, rolling stock manufacturers, engineering consultants, and railway CCTV contractors, this gives a more practical basis for project selection.

If you are working on an EMU, high-speed rail, or pantograph monitoring project, I can help you review the right camera glass configuration and provide supporting test information.

Contact TIENUO to discuss your pantograph camera project or request technical documentation.

[1]: Internal test evidence: Pantograph Camera Glass Gravel Impact Performance Test Report, Report No. WT2021E09D00057. Tested according to TB/T 1451-2017, Clause 6.8.5, using a 20.3 g aluminum projectile at 373.24 km/h. Result: no penetration; test passed.

[2]: EN 356 / P2A security glazing reference: https://www.tecnalia.com/en/news/classification-of-glass-commonly-known-as-anti-intrusion

[3]: EN 50155 railway onboard equipment environment reference: https://www.wago.com/us/railway-standard