A derailed carriage of a Dhaka-bound Panchagarh Express train was recovered and put back onto the tracks, allowing operations to resume
The nurse has been identified as Nazmun Nahar, 31, from Gazipur.
She entered a toilet of Dhanmondi Clinic at Green Road early in the morning on Monday and the authorities had to break the door when she did not come out or respond for over an hour.
Dhanmondi Police Station Inspector AFM Asaduzzaman said there was no other wound on her body. According to employment record, she was married.
"We only found a needle mark under her foot and a syringe in the toilet," he said.
Her family was yet to file a complaint, he told bdnews24.com later in the night.