https://www.usa.gov/copyrighted-government-workshttps://www.rawpixel.com/image/12337198![Freight operations on the Indiana Harbor Belt railroad between Chicago, Illinois and Hammond, Indiana. Fuses (flares) are…](https://images.rawpixel.com/image_social_square/czNmcy1wcml2YXRlL3Jhd3BpeGVsX2ltYWdlcy93ZWJzaXRlX2NvbnRlbnQvbHIvbG9jMjAxNzg0MjMxMi1pbWFnZS5qcGc.jpg)
![Freight operations on the Indiana Harbor Belt railroad between Chicago, Illinois and Hammond, Indiana. Fuses (flares) are…](https://images.rawpixel.com/image_social_square/czNmcy1wcml2YXRlL3Jhd3BpeGVsX2ltYWdlcy93ZWJzaXRlX2NvbnRlbnQvbHIvbG9jMjAxNzg0MjMxMi1pbWFnZS5qcGc.jpg)
Freight operations on the Indiana Harbor Belt railroad between Chicago, Illinois and Hammond, Indiana. Fuses (flares) are used for signaling at twilight and when visibility is otherwise poor. Sourced from the Library of Congress.
Freight operations on the Indiana Harbor Belt railroad between Chicago, Illinois and Hammond, Indiana. Fuses (flares) are used for signaling at twilight and when visibility is otherwise poor. Sourced from the Library of Congress.
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