Rather than omnibuses, I found this bit:

The horse-drawn streetcar was the standard mode of mass transit in New 
York City for over fifty years until steam (starting in 1883) and 
electric (1890) powered trolleys edged onto the scene, followed by the 
growth of the subway starting in 1903. The era of the horse-drawn 
streetcar ended on July 26, 1917 with the closure of the Bleecker Street 
line. By 1912, cars outnumbered horses in New York City, and trolleys 
met their demise at the hands of the automobile and Robert Moses several 
decades later.

https://www.villagepreservation.org/2018/11/14/the-birth-of-mass-transit-in-nyc/


On 7/6/23 10:41, Scott Holmes wrote:
> Thank you very much for this Washington DC color.  I thought I had a 
> copy of your book but couldn't find one, so I ordered a copy.  I had 
> referenced it in my entry for Washington DC in 1854 but failed to 
> include anything about transportation.  This still does not answer my 
> problem with Manhattan, however.  I have a large blank space on my map 
> of Manhattan.  Given that Twain spent a great deal of time in New York 
> City, I would like to address how he got around while there.
>
> On 7/6/23 06:36, John H. Muller wrote:
>> Scott,
>>
>> Here's a blog post from several years ago that briefly looks at Twain's
>> 1854 visit to Washington City and his self-reported travels on a DC
>> omnibus.
>> https://ggwash.org/view/31617/in-1854-tod-meant-proximity-to-omnibus
>>
>> I didn't include in the article context that DC's omnibus system was 
>> much
>> smaller in range and younger in existence than the system in NYC.
>>
>> Good luck with your research.
>>
>> John Muller
>> author, *Mark Twain in Washington, D.C. *
>>
>>
>> On Wed, Jul 5, 2023 at 2:53 PM Scott Holmes<[log in to unmask]>  
>> wrote:
>>
>>> I would appreciate any leads on just how Sam traveled in Manhattan.
>>> There does not seem to be any maps of railroads on the island but there
>>> are ferry terminals.  I must assume that he used omnibuses.
>>>
>>> -- 
>>> /Unaffiliated Geographer and Twain aficionado/
>>>
>>
-- 
/Unaffiliated Geographer and Twain aficionado/