Prasad arrived at 11 in the morning and was taken directly to the investigation team, CBI sources said.
His daughter Misha also accompanied him but was asked to wait in the lobby at the ground floor of the agency headquarters, they said.
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The CBI interrogation was cordial and "all the courtesies were extended" to him, according to the sources.
They said his wish for less spicy food was also fulfilled from the CBI canteen during lunch.
The RJD supremo was offered aloo bhujia, daal and rice during lunch and three rounds of tea, they said.
Prasad also acknowledged that the team was cordial and was "just doing its job" but did not mince any words about the NDA government which he said was trying to "frame" him and his family in "false cases" out of political vendetta.
"The CBI officers were cordial but what can they do? They are following orders of the government of India which is acting out of political vendetta against me and my family. I do not have any complaints against the CBI but it is the union government which is targetting me and my family," he told reporters after coming out of questioning session.
People stood outside the CBI headquarters for a glimpse of Prasad as his Mercedes SUV was being readied for his departure in the evening.
Prasad, whose RJD won maximum seats in the last assembly elections in Bihar, said it was he who had turned the fortunes of railways by recording a profit of Rs 7,000 crore which became a case study for universities like Harvard.
"I had stopped pilferage in railways, made it cost efficient, improved revenue and now I am being blamed for corruption. This is nothing but targetting me and my family," he said.
His son Tejashwi has been called for questioning tomorrow, the sources said.
"I have told the CBI that I will be co-operating. I did not seek time today because else I would have been blamed for running away," Prasad said.
The case pertains to allegations that Prasad, as railway minister, handed over the maintenance of two hotels run by the Indian Railway Catering and Tourism Corporation, a subsidiary of the Indian Railways, in Ranchi and Puri to Sujata Hotel, a company owned by Vinay and Vijay Kochhar, in return for a prime plot of three acres in Patna through a benami company.
The FIR alleged that the RJD leader abused his official position for extending undue favours to the Kochhars and acquired a piece of "high value premium land" through the benami firm Delight Marketing Company.
As a quid pro quo, he "dishonestly and fraudulently" awarded the contract to them for the two hotels.
After the tender was awarded to Sujata Hotel, the ownership of Delight Marketing also changed hands from Sarla Gupta to Rabri Devi and Tejashwi Yadav between 2010 and 2014.
By this time, Prasad had resigned as railway minister.
The CBI registered the case against Prasad, his wife Rabri Devi, son Tejashwi, who was deputy chief minister until a few months ago, and Sarla Gupta, wife of Prem Chand Gupta, a former Union minister.
Others named as accused in the FIR include Vijay and Vinay Kochhar, both directors of Sujata Hotels and owner of Chanakya Hotel, Delight Marketing Company, now known as Lara Projects, and then IRCTC managing director P K Goel.
(Only the headline and picture of this report may have been reworked by the Business Standard staff; the rest of the content is auto-generated from a syndicated feed.)